System and method for adaptive flow control
View Patent ↗The system and method for adaptive flow control transmits pause off packets to network nodes after a calculated time based on switch resource usage thereby alleviating congestion is a network switching system. The method includes measuring a resource usage level in a network switching system, incrementing a register based on the measurement if the measurement exceeds a predetermined level, decrementing the register at a constant rate, and generating a pause off packet when the register is decremented to or below a pre-specified level.
1. A method, comprising:
measuring a resource usage level in a network switching system;
incrementing a register based on the measurement if the measurement exceeds a predetermined level;
decrementing the register at a constant rate; and
generating a pause off packet when the register is decremented to or below a pre-specified level, thereby controlling when a node is allowed to transmit packets on the network, wherein the pause off packet is for instructing a network node to resume packet transmission.
2. The method of claim 1 , further comprising transmitting the pause off packet to a network node associated with the register.
3. The method of clam 1 , wherein the incrementing also increments the register based on prior resource usage measurements.
4. The method of claim 1 , wherein the measuring measures receiving port buffer usage.
5. The method of claim 1 , wherein the measuring measures transmission port buffer usage.
6. The method of claim 1 , wherein the incrementing is proportional to the measurement.
7. The method of claim 1 , further comprising transmitting the pause off packet to all network nodes.
8. A system, comprising:
means for measuring a resource usage level in a network switching system;
means for incrementing a register based on the measurement if the measurement exceeds a predetermined level;
means for decrementing the register at a constant rate; and
means for generating a pause off packet when the register is decremented to or below a pre-specified level, thereby controlling when a node is allowed to transmit packets on the network, wherein the pause off packet is for instructing a network node to resume packet transmission.
9. A system, comprising:
a resource measurement engine capable of measuring resource usage in a network switching system;
a register increment engine, communicatively coupled to the resource measurement engine and a register, capable of incrementing the register based on a resource usage measurement;
a register decrement engine, communicatively coupled to the register, capable of decrementing the register at a constant rate; and
a pause off engine, communicatively coupled to the register, capable of generating a pause off packet when the register is decremented to or below a pre-specified level, thereby controlling when a node is allowed to transmit packets on the network, wherein the pause off packet is for instructing a network node to resume packet transmission.
10. The system of claim 9 , wherein the pause off engine is further capable of transmitting the pause off packet to a network node associated with the register.
11. The system of clam 9 , wherein the register increment engine is also capable of incrementing the register based on prior resource usage measurements.
12. The system of claim 9 , wherein the resource usage includes receiving port buffer usage.
13. The system of claim 9 , wherein the resource usage includes transmission port buffer usage.
14. The system of claim 9 , wherein the register incrementing engine increments the register in proportion to the measurement.
15. The system of claim 9 , wherein the pause off engine is further capable of transmitting the pause off packet to all network nodes.